772 APPENDIX D 7. A pie chart wastes ink on components that are not data; pie charts lack an appropriate scale; pie charts don’t show relative sizes of different components as well as some other graphs, such as a Pareto chart. 8. The Pareto chart does a better job. It draws attention to the most annoying words or phrases and shows the relative sizes of the different categories. Chapter 2: Cumulative Review Exercises Chapter 2: Review Exercises 1. Both distributions are skewed to the right. Email Interarrival Time (minutes) Frequency 0–9 27 10–19 15 20–29 7 30–39 7 40–49 1 50–59 2 60–69 1 2. Because the histogram has a shape that is far from being bellshaped, it suggests that the data are from a population not having a normal distribution. 3. By using fewer classes, the histogram does a better job of illustrating the distribution. 4. There are no outliers. 5. No. There is no pattern suggesting that there is a relationship. 6. a. Time-series graph b. Scatterplot c. Pareto chart 2. a. 1.00 and 1.49 b. 0.995 and 1.495 c. 1.245 3. The distribution is closer to being a normal distribution than the others. Only the single lowest value of 1.09 prevents perfect symmetry, but that one value should not be a basis for stating that the distribution is skewed left. 4. a. Continuous b. Quantitative c. Ratio d. Sample 1. Magnitude Frequency 1.00–1.49 1 1.50–1.99 1 2.00–2.49 5 2.50–2.99 7 3.00–3.49 5 3.50–3.99 1
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